均质土坝管涌发展过程的渗流场空间性状研究

堤坝发生管涌破坏时，渗流场具有强烈的空间特性，管涌发展过程的数值模拟对于堤坝工程管涌预防与治理都具有重要的参考价值。提出以一维通道嵌入三维块体的方法，克服了在三维问题有限元模拟方法上存在的困难。在探讨均质土坝管涌发展过程模拟方法的基础上，使用数值方法分析了土坝管涌发展过程的渗流场时空分布特性；揭示了管涌发展过程中渗流力集中状况及其变化规律。研究表明，改善渗流场的形态是防治堤坝工程管涌的关键措施。

Researches on 3-dimensional seepage fields of soil dam under piping erosion

In the engineering of embankment or earth dam,the occurring of piping erosion may cause great changes in seepage fields.Numerical simulation to piping erosion developing process is very important to piping erosion prevention and treatment.A method of embedding erosion tunnel in 3-dimensional blocks is put forward to solve series of difficulties in FEM simulation.After discussion of some operating problems,an example of earth dam piping erosion is studied.With numerical calculations,3-dimensional characteristics of dam seepage field under developing process of piping erosion are put into analysis;that shows the concentrative seepage status near the developed erosion tunnel.It is concluded that reforming of seepage field is critical method to prevent piping erosion.